Official Dynam 1500mm B-26 Marauder Thread

[rifleman_btx]

[themudduck]

I did balance it at 55, I'm going to 65 now plus I did change the incidence of the tail putting 3 mm of spacers under it just over the tail gunner position. When my new props come in I'll see what happens I also got the nose wheel off the stock p38 and now at least that part looks decent

Looks good! I like that P38 nose wheel. I know we're still playing with the balance... be careful with the elevator throw and hopefully it will behave enough during the flight for you to do some testing. Mine flew OK at 65 but the elevator was sensitive, snap rolls at full elevator, etc. so that's why I put it back to around 60 or a little less.

[Bigrc2]

Nice job, Brent! You worked magic with those speedracers!

Bob

Thanks, Bob. Had fun doing it.

[Tony617]

I have problem with the second screw that holds the tail on. I cannot get the screw to attach to the plastic tail mount. I have put the two screws in without putting the tail on and they both go the hard plastic attachment point and first screw goes through for the tail attachment but second screw does not go in at all. It falls out of the hole when I turn plane right side up. Can I put some glue on the second screw to hold it in place and hopefully it will go into place? I am thinking elmers white glue here.

Thank you,

Tony

[xviper]

I have problem with the second screw that holds the tail on. I cannot get the screw to attach to the plastic tail mount. I have put the two screws in without putting the tail on and they both go the hard plastic attachment point and first screw goes through for the tail attachment but second screw does not go in at all. It falls out of the hole when I turn plane right side up. Can I put some glue on the second screw to hold it in place and hopefully it will go into place? I am thinking elmers white glue here.

Thank you,

Tony

You're missing the hole. ;) I had the same difficulty. Just keeping trying with a magnetized screwdriver with the plane right side up and upside down. You'll find it eventually.

[rifleman_btx]

Looks good! I like that P38 nose wheel. I know we're still playing with the balance... be careful with the elevator throw and hopefully it will behave enough during the flight for you to do some testing. Mine flew OK at 65 but the elevator was sensitive, snap rolls at full elevator, etc. so that's why I put it back to around 60 or a little less.

I set the throw to 1/2 inch should I drop it to 3/8 or 5/16? Seem like 1/2 is the sweet spot for most people

[themudduck]

I set the throw to 1/2 inch should I drop it to 3/8 or 5/16? Seem like 1/2 is the sweet spot for most people

I have mine at 1/2 inch with exponential as well... and I try not to use it all when flying normally. You will need it for landing, for the flare.

[rifleman_btx]

Agreed my expo is at 45%

[themudduck]

Agreed my expo is at 45%

I think mine is 35% but I don't have the radio handy. How much expo to use is really up to personal preference, as I am sure you know. Its great if a plane is very sensitive. But use too much and it can cut in suddenly. Of course its easy to adjust on the radio.

For those reading who may not get what we're talking about.... read this: https://www.rcgroups.com/forums/show...ntial-settings

[rifleman_btx]

Ah yes indeed, sofar everything I run is between 35-45 seems to be the happy points for me and my planes. I'm uploading a video of me flying my rmrc mako in middle of the solar eclipse. Wasn't as dramatic as I would have hoped being here in Texas, but all the same it was pretty cool.

[Tony617]

You're missing the hole. ;) I had the same difficulty. Just keeping trying with a magnetized screwdriver with the plane right side up and upside down. You'll find it eventually.

I tried again yesterday and got the screw into the tail first try. I got the wings on and put the propellers and fired up the motors. Sounds very sweet and is my first twin motor bomber. It sounds real sweet with two propellers spinning up. The only issue is the list numbers on the receiver wires instead of control surfaces. I am using a 7 channel Lemon receiver and so I just assumed "01" was the throttle but when powered up the receiver I found the "03" was the throttle. It made a funny beep from the motors so I looked at the channels on the Detrum receiver in the install guide so I switched the wires and everything works now.

Tony

[themudduck]

I tried again yesterday and got the screw into the tail first try. I got the wings on and put the propellers and fired up the motors. Sounds very sweet and is my first twin motor bomber. It sounds real sweet with two propellers spinning up. The only issue is the list numbers on the receiver wires instead of control surfaces. I am using a 7 channel Lemon receiver and so I just assumed "01" was the throttle but when powered up the receiver I found the "03" was the throttle. It made a funny beep from the motors so I looked at the channels on the Detrum receiver in the install guide so I switched the wires and everything works now.

Tony

Hey Tony, yeah the numbered wires were a bit of a pain to figure out. I hooked mine up to a servo tester and then relabeled most of them (there are a few that were self-evident like the retract and nose steering/rudder.)
So you're telling me that the instructions showed what those numbers meant? Wait... Ah - HAH! :Dizzy: (I just glanced at the instructions, but I did watch Pilot Ryan's build video!!) :Silly:

[TiredIronGRB]

I had some excitement yesterday, the elevator servo died in flight...I was able to ease it down with throttle. While I was replacing the servo I decided to follow MD's lead and work on the incidence of the stab by adding a 1/8" wedge...this made a major difference in how the plane handles, I highly recommend it.

[themudduck]

I had some excitement yesterday, the elevator servo died in flight...I was able to ease it down with throttle. While I was replacing the servo I decided to follow MD's lead and work on the incidence of the stab by adding a 1/8" wedge...this made a major difference in how the plane handles, I highly recommend it.

I think Rifleman was the first to use the spacer. I just lowered the LE. (Either way, its the same result) Were you able to take out the "up" trim, as a result?

[rifleman_btx]

The plane looks like it faired ok, 1/8 inch was my conclusion as well. It really seem to level the stab.

[TiredIronGRB]

I still have a little up trim but not much. RM I was able to land it without issue with the throttle....the elevator was pretty much centered.

[rifleman_btx]

Good to hear that

[OV10]

I still have a little up trim but not much. RM I was able to land it without issue with the throttle....the elevator was pretty much centered.

Don't it just make ya wonder what the pilot skills are of these factory test pilots who say to the designers "oh it flies great" when in fact there is a rudimentary incidence issue that has to be resolved by the higher skilled end users.
I remember when the early version of the Dynam ME-262 had a horizontal stab incidence issue.

[Hardway]

Here are a few updated shots of the B-26. I used some foam to make the seats. I bought the FMS pilots (013) from Motion .https://www.motionrc.com/products/fm...lot-figure-013 I cut one of the pilots for the nose gunner/bombardier. I extended the nose gun since the foam block had to be cut out for the nose graphic. Then I cut out the observation bubble (foam) and replaced it with an acrylic dome from Kit Kraft. 1 1/8". Painted all inside surfaces interior green (Testors Model Master)... Decals from Callie!!! :Cool:

[Hardway]

And I am going to replace the elevator servo with a MG Freewing (17g) servo from the F-14 elevator. (I used HS-82MG's with 2/56 ball links and some tricks to get rid of the chatter in the full flying stab on the F-14). Don't want to land like TI. I have done that before, and it is a bit tricky!! And I will be adjusting the horizontal stab incidence as well... Thanks to all who have contributed to the knowledge base on this bird!! :Drinks: